Access array elements using positive and negative indices with the at() method.
Explanation
arr.at(index): Returns the element at the specified index, supporting negative indices.arr.at(-1): Returns the last element of the array.arr.at(-2): Returns the second-to-last element, and so on.- More readable than
arr[arr.length - 1]for accessing elements from the end.
Usage
To access array elements with positive or negative indices:
const fruits = ['apple', 'banana', 'cherry', 'date'];
// Positive indices (same as bracket notation)
console.log(fruits.at(0)); // 'apple'
console.log(fruits.at(2)); // 'cherry'
// Negative indices (count from end)
console.log(fruits.at(-1)); // 'date' (last element)
console.log(fruits.at(-2)); // 'cherry' (second-to-last)
// Compare with traditional approach
console.log(fruits[fruits.length - 1]); // 'date' (verbose)
console.log(fruits.at(-1)); // 'date' (concise)